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Adjusting the OPV on a Venus

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  • Adjusting the OPV on a Venus

    So I found some threads on CG. Turns out so be pretty easy. But I cant get more than a 2 bar drop in pressure without it looking unsafe. So it is sitting at 12 bar now, down from 14 bar.

    What else can I do now?

  • #2
    Re: Adjusting the OPV on a Venus

    So, here is a picture with the part circled. Just for future reference.

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    • #3
      Re: Adjusting the OPV on a Venus

      Originally posted by recurve boy link=1182250066/0#0 date=1182250066
      So I found some threads on CG. Turns out so be pretty easy. But I cant get more than a 2 bar drop in pressure without it looking unsafe. So it is sitting at 12 bar now, down from 14 bar.

      What else can I do now?
      What do you mean by "unsafe" rb?

      Mal.

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      • #4
        Re: Adjusting the OPV on a Venus

        I originally went to slightly more than 1 turn. But at that point, the rubber seal was starting to get uncomfortably close to being exposed. I did try and pull a shot and it looked like the part was slowly undoing it self under the pressure.

        So I went back half a turn. I pulled a few shots and this was OK.

        Ive adjusted my grind and pulled some more shots tonight. Even at 12 bar I think it is noticeable better.

        Id still like to be able to get down to 9 or 10 bar though. Just because that is what everybody recommends.

        It also seems a lot quieter. Good results for a simple operation!

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        • #5
          Re: Adjusting the OPV on a Venus

          Unusual design this. Valve looks to be on the steam circuit
          http://www.bellabarista.co.uk/isomac/Venus-Parts%20&%20Price%20List.pdf
          Where does that small line end up?
          Interested to hear CSrs suggestions re adjustment on the Venus, sort of considering it as a Silvia option.

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          • #6
            Re: Adjusting the OPV on a Venus

            Correct. To the right of the T is the steam knob. The bottom of the T is where the steam arm comes out. And the Left of the T goes back into the tank.

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            • #7
              Re: Adjusting the OPV on a Venus

              Well guys,

              After looking at the exploded diagram of the Venus linked by VR, I dont believe it has an OPV as there is nothing identified in the parts list that looks remotely like one and there is also nothing in the drawing itself.

              The part you have identified in the photo seems to me to be just the Steam Valve and its intent is easily misunderstood by the confusing nomenclature in the parts list. If there was going to be an OPV, it would be fitted between the end of the High Pressure Hose #34 and the Fitting #35 prior to attaching to the Boiler. Thats my take on it anyway.

              You could always fit an OPV in the location I identified above, they are not very expensive and once setup properly will provide you with the potential for producing excellent brews. All the best,

              Mal.

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              • #8
                Re: Adjusting the OPV on a Venus

                Hmmm ... there was a thread about this on Coffeegeek. I followed the instructions there ... Ill try to find it again.

                Cant find it but here is a nice link http://www.home-barista.com/forums/i-am-going-to-muck-about-with-my-opv-valve-t2582.html

                Oh, and the part certainly behaves like an OPV.

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                • #9
                  Re: Adjusting the OPV on a Venus

                  Well,

                  I beg to disagree RB, from your description above it isnt behaving like an OPV at all, more likely that it is just bleeding off boiler pressure as a result of being loosened off, and not actually regulating the pump output pressure the way an OPV operates.

                  That Home Barista post you linked to refers to what I was trying to convey in my post above.... i.e. insert a genuine OPV in between the output of the Pump and the input to the Boiler. Its quite a common mod that owners of non-OPV machines employ to enjoy the benefits of true 8.5-9.0 Bar espresso shots.

                  Cheers mate,
                  Mal.

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                  • #10
                    Re: Adjusting the OPV on a Venus

                    RB how did you go with the Venus OPV, I came across a thread over on CG if your interested.

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                    • #11
                      Re: Adjusting the OPV on a Venus

                      Originally posted by vicroamer link=1182250066/0#9 date=1186265583
                      RB how did you go with the Venus OPV, I came across a thread over on CG if your interested.
                      Post links first ask questions later.

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                      • #12
                        Re: Adjusting the OPV on a Venus

                        http://www.coffeegeek.com/forums/espresso/machines/29416
                        You may find this thread of interest.

                        Comment


                        • #13
                          Re: Adjusting the OPV on a Venus

                          Originally posted by vicroamer link=1182250066/0#11 date=1186482664
                          http://www.coffeegeek.com/forums/espresso/machines/29416
                          You may find this thread of interest.
                          I finally got a round to looking at that. I found that the first time I was trying to adjust the OPV. Its still kinda weird.

                          Anyway, I was never getting bad results, but I dont think my pressure is at 9 bars. I up dose a fair bit on my machine to get a good pour compared to other machines Ive tried.

                          I was just wondering if getting my pressure to 9 bar would make a difference. At the time I did the adjustment, I think my results were better.

                          This is all just a experiment. It would be nice to be able to change stuff on my machine though. Anyone want a Venus so I can get me a Domobar???

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